Gregory's U.S. and California Express, Thompson & Hitchcock, Agts., 149 Pearl St., N.Y. Partly clear red three-line handstamp and Bison pictorial handstamp on Jun. 30, 1850 folded letter from Joseph W. Gregory to James Gordon Bennett at The New York Herald in New York City, "Gregory's New York & California Express" oval handstamp used as a letterhead, in his letter Gregory sends a parcel of Yellow Monkey Flower seeds to Bennett as a gift and offers to send more examples to Bennett and his associates (Gregory's skill in wooing the press was no doubt part of his formula for success), the enigmatic Bison marking is also found on other covers from California, but its meaning and source have never been clear to us -- a wonderful express cover, ex Hahn

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